ELECTROCHEMICAL BEHAVIOR OF 300M AND Cr9 STEEL IN ACIDIC ENVIRONMENTS

Journal of Chinese Society for Corrosion and protection

2012, Vol. 32

Issue (6): 449-454 DOI:

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ELECTROCHEMICAL BEHAVIOR OF 300M AND Cr9 STEEL IN ACIDIC ENVIRONMENTS

SUN Min¹, XIAO Kui¹, DONG Chaofang¹, LI Xiaogang¹, ZHONG Ping²

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083

2. Beijing Institute of Aeronautical Materials, Beijing 100095

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Abstract

The electrochemical behavior of 300M and a new kind of ultra high strength steel (Cr9 for short) in sulfate acidic environment, as well as the effects of pH and Cl^- concentration on the corrosion behavior were studied by potentiodynamic polarization curve, EIS, and metallographic microscope. The results showed that with increasing pH value, the corrosion potentials E_corr of 300M and Cr9 shifted towards the positive direction, the charge-transfer resistances R_ct increased, and the corrosion current densities em_corr decreased. The (H₂SO₄+Na₂SO₄) solution with decreasing pH value suppressed the corrosion rates of 300M and Cr9. In the chloride-free sulfate acidic solution, general corrosion on the 300M surface occurred, while on Cr9 surface pitting occurred. The addition of chloride ions induced the pittings and transformed the passivity of Cr9 into an active dissolution state. Cr9 steel contains more contents of Cr, Mo and Ni, and the elements enhanced the corrosion resistance in acidic solution and made a much lower corrosion rate compared with 300M.

Key words: 300M ultrahigh strength steel acidic solution electrochemistry passivity

Received: 10 January 2012

ZTFLH:

TG172.3

Corresponding Authors: LI Xiaogang E-mail: lixiaogang99@263.net

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SUN Min, XIAO Kui, DONG Chaofang, LI Xiaogang, ZHONG Ping. ELECTROCHEMICAL BEHAVIOR OF 300M AND Cr9 STEEL IN ACIDIC ENVIRONMENTS. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 449-454.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I6/449

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